221121201113 has 2 divisors, whose sum is σ = 221121201114. Its totient is φ = 221121201112.

The previous prime is 221121201079. The next prime is 221121201151. The reversal of 221121201113 is 311102121122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219053953024 + 2067248089 = 468032^2 + 45467^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121201113 - 2²⁰ = 221120152537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221121201091 and 221121201100.

It is not a weakly prime, because it can be changed into another prime (221121203113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560600556 + 110560600557.

It is an arithmetic number, because the mean of its divisors is an integer number (110560600557).

Almost surely, 2^221121201113 is an apocalyptic number.

It is an amenable number.

221121201113 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121201113 is an equidigital number, since it uses as much as digits as its factorization.

221121201113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221121201113 its reverse (311102121122), we get a palindrome (532223322235).

The spelling of 221121201113 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred thirteen".